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Re: census data and batch export to file with each layer sent to a canvas of that siz

first thing to do is exporting layers to files , and use png to preserve transparancy http://simplephotoshop.com/elementsplus/v5/en/layers-to-files.htm

after this is done you can make an action that trims each file (choose Image > Trim in Photoshop's menu)

http://www.creativetechs.com/iq/dont_crop_use_photoshops_trim_feature.html

wih this action you can do a batch processing on all your files at once